### Home Classes Methods

### In Files

- lib/taskjuggler/UTF8String.rb
- lib/taskjuggler/Painter/FontMetrics.rb
- lib/taskjuggler/deep_copy.rb

### Parent

BasicObject

### Methods

- #deep_clone

### Files

- CHANGELOG
- COPYING
- README.rdoc

### Class/Module Index

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No matching classes.

# Object

This file extends some Ruby core classes to add deep-copying support. I'm aware of the commonly suggested method using Marshal:

class Object

    def deep_copy
      Marshal.load(Marshal.dump(self))
    end

end

But just because I program in Ruby, I don't have to write bloatware. It's like taking a trip to the moon and back to shop groceries at the store around the corner. I'm not sure if I need more special cases than Array and Hash, but this file works for me.

In certain cases the full deep copy may not be desired. To preserve references to objects, you need to overload deep_clone and handle the special cases. Alternatively, an object can be frozen to prevent deep copies.

### Constants

GeneratorMode

  Set this flag to true to generate FontData.rb. This will require the prawn gem to be installed. For normal operation, this flag must be set to false.

KCODE

  # UTF8String.rb -- The TaskJuggler III Project Management Software

  Copyright © 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013

      by Chris Schlaeger <chris@linux.com>

  This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation.

### Public Instance Methods

deep_clone() click to toggle source

This is a variant of Object#clone that returns a deep copy of an object.

    # File lib/taskjuggler/deep_copy.rb, line 34
    def deep_clone
      # We can't clone frozen objects. So just return a reference to them.
      # Built-in classed can't be cloned either. The check below is probably
      # cheaper than the frequent (hiddent) exceptions from those objects.
      return self if frozen? || nil? || is_a?(Fixnum) || is_a?(Float) ||
                     is_a?(TrueClass) || is_a?(FalseClass) || is_a?(Symbol)

      # In case we have loops in our graph, we return references, not
      # deep-copied objects.
      if RUBY_VERSION < '1.9.0'
        return @clonedObject if instance_variables.include?('@clonedObject')
      else
        return @clonedObject if instance_variables.include?(:@clonedObject)
      end

      # Clone the current Object (shallow copy with internal state)
      begin
        @clonedObject = clone
      rescue TypeError
        return self
      end
      # Recursively copy all instance variables.
      @clonedObject.instance_variables.each do |var|
        val = instance_variable_get(var).deep_clone
        @clonedObject.instance_variable_set(var, val)
      end
      if kind_of?(Array)
        @clonedObject.collect! { |x| x.deep_clone }
      elsif kind_of?(Hash)
        @clonedObject.each { |key, val| store(key, val.deep_clone) }
      end
      # Remove the @clonedObject again.
      if RUBY_VERSION < '1.9.0'
        remove_instance_variable('@clonedObject')
      else
        remove_instance_variable(:@clonedObject)
      end
    end

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